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Study the Optimization of Stocking Density of Tilapia and Carps in Poly-culture System at Earthen Ponds of Bapard Campus of Gopalganj District

MM Nabi
Director (In charge)
Bangabandhu Academy for Poverty Alleviation and Rural Development (BAPARD), Kotalipara, Gopalgonj, Dhaka, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to determine the growth and production of tilapia (Oreochromis niloticus) with rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus mrigala), and silver carp (Hypophthalmichthys molitrix) in poly-culture system for a period of 135 days at nine earthen ponds. The experiment was carried out under three treatments each with three replications. The stocking density was 220 fingerlings per decimal (tilapia 200, rohu 5, catla 5, mrigal 5, and silver carp 5) under T₁, 270 fingerlings per decimal (tilapia 250, rohu 5, catla 5, mrigal 5, and silver carp 5) under T₂ and 320 fingerlings per decimal (tilapia 300, rohu 5, catla 5, mrigal 5 and silver carp 5) under T₃. The average initial length and weight of the fingerlings of tilapia (Oreochromis niloticus), rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus mrigala), and silver carp (Hypophthalmichthys molitrix) were 2.15±0.10 cm, 6.10±0.30 cm, 7.81±0.23 cm, 6.15±0.54 cm, 5.20±0.42 cm, and 7.50±0.16 g, 23.50±0.14 g and 20.12±0.15 g, 19.20±0.18 g, 21.25±0.17 g respectively. The ponds were fertilized fortnightly with urea and TSP at the rates of 100 g and 50 g per decimal respectively. Mean survival rates of fish under T₁, T₂ and T₃ were 76%, 74.8%, and 68% respectively. The specific growth rates (SGR, % per day) of fish under T₁, T_2, and T₃ were 2.21%, 2%, and 1.80%. The calculated net fish production of the ponds under T₁ was 27.29 kg/dec. and that of the ponds under T₂ was 25.08 kg/dec. and 21.79 kg/dec. inT₃. The BCR was calculated 1:1.38 for T₁, 1:1.20 for T_2, and 1:1.06 for T₃. The findings of these experiments revealed that among three treatments, the stocking density 220 per decimal (T₁) is the most suitable.

Keywords: Stocking density, Tilapia, Carps, Poly-culture

Location: Pond of Bangabandhu Academy for Poverty Alleviation and Rural Development campus, Gopalganj

Start Date: 00-08-2020

End Date: 00-12-2020

Program Area: Animal Health and Management

Commodity: Tilapia, Carp fish

Objectives:

To observe optimum stocking density of Tilapia in carp poly-culture with supplemental feed, under the condition of Bangladesh aquaculture.

Methodology:

The present experiment was carried out for a period of 135 days from 1^st August/2020 to 15^th December/ 2020. It has been located at the Pond of BAPARD campus, Gopalganj (located at 22.9833°N 89.9917°E). The ponds were drained out completely and aquatic weeds were removed manually. Liming was done in all ponds at the rate of 1 kg/decimal. One week after liming the ponds were filled with water and fertilized with urea and TSP at the rate of 200 gm/decimal and 100 gm/decimal respectively. TSP was soaked overnight, then urea and TSP were dissolved together and spread manually on pond water surface on sunny days (10-10.30 am). To enhance the growth of natural food for the carps, fertilization was done with urea (200 gm/dec) and TSP (100 gm/dec) ten a month. The ponds were the same in size (10 Dec.) and similar in shape and depth. All the carp were collected from Sonali Fish Farm and hatchery (Pvt) Ltd, Kotalipara, Gopalganj. Water quality parameters of the experimental ponds were recorded throughout the study period. The water temperature (ºC), dissolved oxygen (ppm) and hydrogen ion concentration (pH), ammonia (NH₃), and Nitrite (NO₂) were monitored at the beginning and end of the experiment by using a proper instrument. Sampling was done 15 days interval from each pond by cast net and the weight of fish was recorded by using an electric balance (Model: FKS-5000). After harvesting of fish, the final weight was recorded and the following parameters were used to evaluate the growth and production of the fish. The recorded data were entered into the spreadsheet in MS Excel 2010 and then summarized properly before statistical analysis. After entering the data, the descriptive statistical analyses were done by MS Excel. The inferential T-test was carried out using SPSS (Statistical Package for Social Sciences) version 22.

Source of Information: International Journal of Fisheries and Aquatic Research- Volume 6, Issue 1, 2021, Page No. 34-39

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Funding Source:

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Achievement/Findings:

Higher stocking densities resulted in lower BCR because of the high cost of fingerlings coupled with poor fish growth and a very low survival rate. On the other hand, at the lowest stocking density T₁ (220 fingerlings per dec), BCR was very high because the cost for fingerlings was very low and at the same time survival rate and fish growth rate were satisfactory resulting in high fish yield. The present study confirms that stocking density along with the mixing ratio of tilapia and carp has a tremendous influence on the productivity and profitability of fish production. For higher productivity, tilapia with carp poly-culture in T₁ (220 fingerlings per dec) can be recommended.

Knowledge Management: Journal